A knight on the rim is dim.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown232"]
[Result "*"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/2p1N1b1/1p5p/8/1R6/4P1Pk/r7/6K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rh4+ Kxg3 2. Nf5+ Kf3 3. Rf4+ ( { White can try: } 3. Nxg7 Rg2+ 4. Kf1 Rxg7 5. e4 Rg4 6. Rxh6 Kxe4 { Black wins with a large material advantage. } ) 3... Ke2 4. Rf2+ Kd3 5. Rxa2 { White wins with a large material advantage. } *